Safety-valve.



PATENTED JULY 2, 1907.

1 ,.RM MVM. SLD NAD Hmm TEM MMM Sm I NELS T. HANSON, OF HAWARDEN, IOWA.

SAFETY-VALVE.

Specication of Letters Patent.

Patented July 2, 1907.

Application filed December 18,1905. Serial No. 292,202.

To all whom it may concern:

Be it known that I, NELs T. HANsoN, a citizen of the4 United States,residing at Hawarden, in the county of Sioux, State of Iowa, haveinvented certain new and useful Improvements in Safety Valves; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to valves and moreparticularly to safety valvesand has for its object to provide a valve which may be easily adjustedto suit different conditions and which will be provided with means forindicating the pressure necessary to unseat the valve. Other objects andadvantages will be apparent from the following description.

In the drawings forming a portion of this specifica-v tion and in whichlike numerals of reference indicate similar parts in'the several views,Figure l is a side elevation of the present valve. Fig. 2 is a verticalsection therethrough.

Referring now to the drawings, the present invention includes a hollow.cylindrical member 47, and at its lower end, this member is providedwith an upwardly directed valve seat 48 arranged to receive a valve 50.At its upper end, the member is provided with a cap 51 screwed thereuponand having a central threaded opening 52 in which there is engaged ahollow threaded rod 53 having a hand grip at its upper end and having anopening in its lower end in which there is engaged for sliding movementa stem 54, secured at its lower end to the valve 50. Engaged with thestem 54 between the valve and the lower end of the rod 53, there is ahelical spring 55 which is thus arranged to hold the valve yieldably inits seat and it will be readily seen that the rod 53 may be screwed intoand out of the member 47 to vary the tension of the spring.

Above the valve seat, the cylindrical member is provided with an outletpassage 56.

An indicator similar to that described in the first form of the valve isprovided, to show the pressure necessary to unseat the valve. Thisindicator consists of a plate 57 having a central perforation in whichthe rod 53 isengaged, above the member 47, and above and below thisplate the rod is provided with laterally extending pins 58 which preventlongitudinal movement of the plate upon the rod, though permittingrotary motion thereof. The plate 57 has downwardly extending members 59at diametrically opposite points thereof, these members being connectedat their lower ends by a semi-circular band 60, extending horizontallyat one side of the member 47, and at the opposite side of the member 47,pointers 61 extend toward each other from the members 59 and are curvedto conform to the convexity of the member 47. A scale .62 is markedlongitudinally upon the member 47 between these pointers 61, the scalebeing carried by a scale plate 63 secured to the cylindrical member andthe pointers 61 indicate upon the scale the pressure neces sary tounseat the valve 50. To prevent rotation of the plate 57 with the rod53, the cylindrical member is provided with pins 64 against which theedges of the members 59 rest.

What is claimed is:

1. A safety valve comprising a hollow member having a valve seat at eneend, .a valve for the seat, a rod movably engaged in the member', aspring engaged between said rod and the valve arranged to hold thelatter in its'seat, said rod being operable to vary the tension of thespring, a plate connected with the rod for movement therewith, memberscarried by the plate, a scale, and fingers carried by the members andarranged for movement over the scale when the rod is moved.

2. A safety valve comprising a hollow cylindrical member having a valves'eat at its lower end, a valve for the seat, said member having athreaded opening` in its upper end, a threaded rod engaged in saidopening, a spring engaged between said threaded rod and the valve andarranged tohold the latter in its seat, a plate revolubly connected withthe rod for bodily movement therewith, downwardly extending memberscarried by the plate, a connecting band for the lower ends of saidmembers, ngers carried by said members and extending over the firstnamed member, and a scale carried by the rst named member for indicationby the fingers.

In testimony whereof, I affix my signature, in presence of twoWitnesses.

NELS T. HANSON.

Witnesses:

M. SEHON, .TosEPn WEBER.

